<?php
namespace app\index\model;

use Think\Model;

class Wechat extends Model
{

    //接口API URL前缀
    const API_URL_PREFIX = 'https://api.mch.weixin.qq.com';
    //下单地址URL
    const UNIFIEDORDER_URL = "/pay/unifiedorder";
    //查询订单URL
    const ORDERQUERY_URL = "/pay/orderquery";
    //关闭订单URL
    const CLOSEORDER_URL = "/pay/closeorder";
    //退款URL
    const REFUND_URL = "/secapi/pay/refund";
    //证书路径
    const SSLCERT_PATH= "../".CERTPEM;
    const SSLKEY_PATH= "../".KEYPEM;
    const CAINFO_PATH= "../".CERTP12;
		
// 		const SSLCERT_PATH="E:\WWWroot2\cunjiu/public/static/cert/apiclient_cert.pem";
//     const SSLKEY_PATH="E:\WWWroot2\cunjiu/public/static/cert/apiclient_key.pem";
//     const CAINFO_PATH="E:\WWWroot2\cunjiu/public/static/cert/apiclient_cert.p12";

    //公众账号ID
    private $appid;
    //商户号
    private $mch_id;
    //随机字符串
    private $nonce_str;
    //签名
    private $sign;
    //商品描述
    private $body;
    //商户订单号
    private $out_trade_no;
    //支付总金额
    private $total_fee;
    //终端IP
    private $spbill_create_ip;
    //支付结果回调通知地址
    private $notify_url;
    //交易类型
    private $trade_type;
    //支付密钥
    private $key;
    //所有参数
    private $params = array();

    public function __construct()
    {
			parent::__construct();
//         $this->appid = "wx25b9d50ab97410be";//你的appid
//         $this->mch_id = "1401609402";  //商户id即商户号
//         $this->key = "xianpinzhaiweiabcdefghigklmnopqr";//商户api秘钥
        $this->appid = WX_APPID;//你的appid
        $this->mch_id = WX_MCHID;  //商户id即商户号
        $this->key = WX_KEY;//商户api秘钥
        $this->notify_url = "";//异步回调链接地址
    }
    /**
     * 微信退款接口
     *
     * @return void
     */
    public function refund($params)
    {			
        $this->params['appid'] = $this->appid;
        $this->params['mch_id'] = $this->mch_id;
        $this->params['nonce_str'] = md5(rand(10000000,99999999));
       // $this->params['transaction_id']=$params['transaction_id'];
        $this->params['out_trade_no']=$params['out_trade_no'];
        $this->params['out_refund_no']=$params['out_refund_no'];
        $this->params['total_fee']=$params['total_fee'];
        $this->params['refund_fee']=$params['refund_fee'];
        $this->params['sign'] = $this->MakeSign($this->params);

        $xml = $this->data_to_xml($this->params);
        $response = $this->postXmlCurl($xml, self::API_URL_PREFIX . self::REFUND_URL, true);

        if (!$response) {
            return false;
        }
        $result = $this->xml_to_data($response);
        if (!empty($result['result_code']) && !empty($result['err_code'])) {
            $result['err_msg'] = $this->error_code($result['err_code']);
        }
        return $result;
    }

    /**
     * 统一下单
     * @param   $params
     */
    public function unifiedOrder($params)
    {
        $this->body = $params['body'];
        $this->out_trade_no = $params['out_trade_no'];
        $this->total_fee = $params['total_fee'];
        $this->trade_type = $params['trade_type'];
        $this->nonce_str = rand_string(32);
        $this->spbill_create_ip = $_SERVER['REMOTE_ADDR'];
        $this->params['appid'] = $this->appid;
        $this->params['mch_id'] = $this->mch_id;
        $this->params['nonce_str'] = $this->nonce_str;
        $this->params['body'] = $this->body;
        $this->params['out_trade_no'] = $this->out_trade_no;
        $this->params['total_fee'] = $this->total_fee;
        $this->params['spbill_create_ip'] = $this->spbill_create_ip;
        $this->params['notify_url'] = $this->notify_url;
        $this->params['trade_type'] = $this->trade_type;
				
        //获取签名数据
        $this->sign = $this->MakeSign($this->params);
        $this->params['sign'] = $this->sign;
				

        $xml = $this->data_to_xml($this->params);
        $response = $this->postXmlCurl($xml, self::API_URL_PREFIX . self::UNIFIEDORDER_URL);
        if (!$response) {
            return false;
        }
        $result = $this->xml_to_data($response);
        if (!empty($result['result_code']) && !empty($result['err_code'])) {
            $result['err_msg'] = $this->error_code($result['err_code']);
        }
        return $result;
    }

    /**
     * 查询订单信息
     * @param $out_trade_no     订单号
     * @return array
     */
    public function orderQuery($out_trade_no)
    {
        $this->params['appid'] = $this->appid;
        $this->params['mch_id'] = $this->mch_id;
        $this->params['nonce_str'] = rand_string(32);
        $this->params['out_trade_no'] = $out_trade_no;
        //获取签名数据
        $this->sign = $this->MakeSign($this->params);
        $this->params['sign'] = $this->sign;
        $xml = $this->data_to_xml($this->params);
        $response = $this->postXmlCurl($xml, self::API_URL_PREFIX . self::ORDERQUERY_URL);
        if (!$response) {
            return false;
        }
        $result = $this->xml_to_data($response);
        if (!empty($result['result_code']) && !empty($result['err_code'])) {
            $result['err_msg'] = $this->error_code($result['err_code']);
        }
        return $result;
    }

    /**
     * 关闭订单
     * @param $out_trade_no     订单号
     * @return array
     */
    public function closeOrder($out_trade_no)
    {
        $this->params['appid'] = $this->appid;
        $this->params['mch_id'] = $this->mch_id;
        $this->params['nonce_str'] = rand_string(32);
        $this->params['out_trade_no'] = $out_trade_no;
        //获取签名数据
        $this->sign = $this->MakeSign($this->params);
        $this->params['sign'] = $this->sign;
        $xml = $this->data_to_xml($this->params);
        $response = $this->postXmlCurl($xml, self::API_URL_PREFIX . self::CLOSEORDER_URL);
        if (!$response) {
            return false;
        }
        $result = $this->xml_to_data($response);
        return $result;
    }
    /**
     *
     * 获取支付结果通知数据
     * return array
     */
    public function getNotifyData()
    {

        //如果出现接收不到数据问题 请用下面被注释的方法
        //$xml=file_get_contents("php://input");
        ////php 7.0 以后已经废除了 HTTP_RAW_POST_DATA  请注意php版本
        //获取通知的数据
        $xml = $GLOBALS['HTTP_RAW_POST_DATA'];
        $data = array();
        if (empty($xml)) {
            return false;
        }
        $data = $this->xml_to_data($xml);
        if (!empty($data['return_code'])) {
            if ($data['return_code'] == 'FAIL') {
                return false;
            }
        }
        return $data;
    }


    /**
     *
     * 获取退款通知的数据
     * return array
     */
    public function getRefundData($xml)
    {
        $data = array();
        if (empty($xml)) {
            return false;
        }
        $data = $this->xml_to_data($xml);
        if (!empty($data['return_code'])) {
            if ($data['return_code'] == 'FAIL') {
                return false;
            }
        }
        return $data;
    }

    /**
     * 接收通知成功后应答输出XML数据
     * @param string $xml
     */
    public function replyNotify()
    {
        $data['return_code'] = 'SUCCESS';
        $data['return_msg'] = 'OK';
        $xml = $this->data_to_xml($data);
        echo $xml;
        die();
    }

    /**
     * 生成APP端支付参数
     * @param  $prepayid   预支付id
     */
    public function getAppPayParams($prepayid)
    {
        $data['appid'] = $this->appid;
        $data['partnerid'] = $this->mch_id;
        $data['prepayid'] = $prepayid;
        $data['package'] = 'Sign=WXPay';
        $data['noncestr'] = rand_string(32);
        $data['timestamp'] = time();
        $data['sign'] = $this->MakeSign($data);
        return $data;
    }

    /**
     * 生成签名
     * @return 签名
     */
    public function MakeSign($params)
    {
				//dump($params);exit();
        //签名步骤一：按字典序排序数组参数
       
				
        $string = $this->ToUrlParams($params);
        //签名步骤二：在string后加入KEY
        $string = $string . "&key=" . $this->key;
        //签名步骤三：MD5加密
        $string = md5($string);
        //签名步骤四：所有字符转为大写
        $result = strtoupper($string);
        return $result;
    }

    /**
     * 将参数拼接为url: key=value&key=value
     * @param   $params
     * @return  string
     */
    public function ToUrlParams($params)
    {
			ksort($params);

        $buff = "";
					foreach ($params as $k => $v) {
							if ($k != "sign" && $v != "" && !is_array($v)) {
									$buff .= $k . "=" . $v . "&";
							}
					}
					$buff = trim($buff, "&");
					return $buff;
        
    }

    /**
     * 输出xml字符
     * @param   $params     参数名称
     * return   string      返回组装的xml
     **/
    public function data_to_xml($params)
    {
        if (!is_array($params) || count($params) <= 0) {
            return false;
        }
        $xml = "<xml>";
        foreach ($params as $key => $val) {
            if (is_numeric($val)) {
                $xml .= "<" . $key . ">" . $val . "</" . $key . ">";
            } else {
                $xml .= "<" . $key . "><![CDATA[" . $val . "]]></" . $key . ">";
            }
        }
        $xml .= "</xml>";
        return $xml;
    }

    /**
     * 将xml转为array
     * @param string $xml
     * return array
     */
    public function xml_to_data($xml)
    {
        if (!$xml) {
            return false;
        }
        //将XML转为array
        //禁止引用外部xml实体
        libxml_disable_entity_loader(true);
        $data = json_decode(json_encode(simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA)), true);
        return $data;
    }

    /**
     * 获取毫秒级别的时间戳
     */
    private static function getMillisecond()
    {
        //获取毫秒的时间戳
        $time = explode(" ", microtime());
        $time = $time[1] . ($time[0] * 1000);
        $time2 = explode(".", $time);
        $time = $time2[0];
        return $time;
    }

    /**
     * 以post方式提交xml到对应的接口url
     *
     * @param string $xml 需要post的xml数据
     * @param string $url url
     * @param bool $useCert 是否需要证书，默认不需要
     * @param int $second url执行超时时间，默认30s
     * @throws WxPayException
     */
    private function postXmlCurl($xml, $url, $useCert = false, $second = 30)
    {
       $ch = curl_init();
			 //exit();
        //设置超时
				$header[] = "Content-type: text/xml";
        curl_setopt($ch,CURLOPT_TIMEOUT,$second);
        curl_setopt($ch,CURLOPT_URL,$url);
        curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,false);
        curl_setopt($ch,CURLOPT_SSL_VERIFYHOST,2);
        //设置header
        curl_setopt($ch,CURLOPT_HEADER,false);
        //要求结果为字符串且输出到屏幕上
        curl_setopt($ch,CURLOPT_RETURNTRANSFER,true);
        if ($useCert == true) {
        //设置证书
        //使用证书：cert 与 key 分别属于两个.pem文件
					curl_setopt($ch,CURLOPT_SSLCERT,self::SSLCERT_PATH);
					curl_setopt($ch,CURLOPT_SSLKEY,self::SSLKEY_PATH);
          curl_setopt($ch,CURLOPT_CAINFO,self::CAINFO_PATH);
        }
        //post提交方式
				curl_setopt($ch,CURLOPT_HTTPHEADER, $header);
				curl_setopt($ch,CURLOPT_POST,true);
        curl_setopt($ch,CURLOPT_POSTFIELDS,$xml);

        //运行curl
 
				$gf = curl_getinfo($ch);

        $data = curl_exec($ch);
				
        //返回结果
        if ($data) {
            curl_close($ch);
            return $data;
        }else{
            $error = curl_errno($ch);
            curl_close($ch);
            return false;
        }
    }
    /**
     * 错误代码
     * @param  $code       服务器输出的错误代码
     * return string
     */
    public function error_code($code)
    {
        $errList = array(
            'NOAUTH' => '商户未开通此接口权限',
            'NOTENOUGH' => '用户帐号余额不足',
            'ORDERNOTEXIST' => '订单号不存在',
            'ORDERPAID' => '商户订单已支付，无需重复操作',
            'ORDERCLOSED' => '当前订单已关闭，无法支付',
            'SYSTEMERROR' => '系统错误!系统超时',
            'APPID_NOT_EXIST' => '参数中缺少APPID',
            'MCHID_NOT_EXIST' => '参数中缺少MCHID',
            'APPID_MCHID_NOT_MATCH' => 'appid和mch_id不匹配',
            'LACK_PARAMS' => '缺少必要的请求参数',
            'OUT_TRADE_NO_USED' => '同一笔交易不能多次提交',
            'SIGNERROR' => '参数签名结果不正确',
            'XML_FORMAT_ERROR' => 'XML格式错误',
            'REQUIRE_POST_METHOD' => '未使用post传递参数 ',
            'POST_DATA_EMPTY' => 'post数据不能为空',
            'NOT_UTF8' => '未使用指定编码格式',
        );
        if (array_key_exists($code, $errList)) {
            return $errList[$code];
        }
    }
}
